Malicious PDF — malware analysis report

Static analysis result for SHA-256 3309d071ff67cb87…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 10:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11b6b5c09bac6e5515750f2be4653faa SHA-1: f57037372d9c3f2a8a0e3fe3ed23a48186d4acc3 SHA-256: 3309d071ff67cb87db7c6044b4e09479830fb97c32f49e356c99b8f5e9e90205
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=small+business+asset+write+off+2019 PDF link annotation
    • http://bestapp4u.com/admin/uploadedfiles/file/74928273152.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/pogekumewodusomajalato.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/fojilodidepowovo.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/konekemotikusasap.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/34d969cbc88ea3adb00dee3a2a82fccf/pukabakugamugajijufali.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210901021107.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/25233891454.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/1m3fjkgu4hmueodca7sqb8oabo/zedepimugom.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/mubixeju.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/43114742385.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210510080607_903121462.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ei5dq3jiomb9b8ro71u8c4mcq5/jebukotiv.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/22355267792.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52c2b8763---99313147473.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16cc51ef2---38747862180.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa71be0f6---nurazomasipabinimakexam.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/47099037281.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/nowukemujixezolabetugo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607880d848915---37523557291.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/fuwizoburanuvekekup.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/tisiponosul.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160db4a8da9d3c---xojited.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/fe5c12ce26effaf11b20e8a701a95497/88088618833.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/tukavu.pdfIn PDF document text
    • https://samudra99.com/contents//files/51414295788.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 11236 bytes
SHA-256: 7af2a880d70b2374547fb29286c75d3f950d06fa025761982c10350ee3f0d2c5
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 17172 bytes
SHA-256: 27cd6aa6bca57c22cdd13214244bcb0a560cdcd6e29133ac776d37de7fa696ad
font_02_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.